pregnancy risk

I’m not using any contraceptives, and recently my boyfriend and I had unprotected sex and he ejaculated inside me. The following day I took emergency contraceptives. I was supposed to get my period a few weeks later, but I didn’t. So then I bought a home pregnancy test and it came out positive, but I don’t believe that I’m pregnant.

I’ve been a nervous wreck for the past couple of days. The other day, I was on day 3 of my period, and I had my boyfriend over. We have never had sex and I pride myself on that. Occasionally, though, he will stick his hands down my pants. He doesn’t finger me or anything, he just puts his hand down there.

My boyfriend and I mutually masturbate each other. We take turns; I’ll do it to him and then he’ll to it to me. If we are careful to wipe all the semen off of our hands, his hands especially, is there any way I could get pregnant from this? Or is it just a risk if there would be actual fluid that got inside me?